initial commit

chapter19/sar_loadmon.ksh

@@ -0,0 +1,92 @@
+#!/bin/ksh
+#
+# SCRIPT: sar_loadmon.ksh
+# AUTHOR: Randy Michael
+# DATE: 07/26/2007
+# REV: 1.0.P
+# PLATFORM: AIX, HP-UX, Linux, and Solaris
+#
+# PURPOSE: This shell script take multiple samples of the CPU
+#          usage using the "sar" command. The average or
+#          sample periods is shown to the user based on the 
+#          UNIX operating system that this shell script is
+#          executing on. Different UNIX flavors have differing
+#          outputs and the fields vary too.
+#
+# REV LIST:
+#
+#
+# set -n # Uncomment to check the script syntax without any execution
+# set -x # Uncomment to debug this shell script
+#
+###################################################
+############# DEFINE VARIABLES HERE ###############
+###################################################
+
+SECONDS=30  # Defines the number of seconds for each sample
+INTERVAL=10 # Defines the total number of sampling intervals
+OS=$(uname) # Defines the UNIX flavor
+
+###################################################
+##### SETUP THE ENVIRONMENT FOR EACH OS HERE ######
+###################################################
+
+# These "F-numbers" point to the correct field in the
+# command output for each UNIX flavor.
+
+case $OS in
+AIX|HP-UX|SunOS)   
+       F1=2
+       F2=3
+       F3=4
+       F4=5
+       echo "\nThe Operating System is $OS\n"
+       ;;
+Linux)
+       F1=3
+       F2=4
+       F3=5
+       F4=6
+       echo "\nThe Operating System is $OS\n"
+       ;;
+*) echo "\nERROR: $OS is not a supported operating system\n"
+   echo "\n\t...EXITING...\n"
+   exit 1
+   ;;
+esac
+
+###################################################
+######## BEGIN GATHERING STATISTICS HERE ##########
+###################################################
+
+echo "Gathering CPU Statistics using sar...\n"
+echo "There are $INTERVAL sampling periods with"
+echo "each interval lasting $SECONDS seconds"
+echo "\n...Please wait while gathering statistics...\n"
+
+# This "sar" command take $INTERVAL samples, each lasting
+# $SECONDS seconds. The average of this output is captured.
+
+sar $SECONDS $INTERVAL | grep Average \
+          | awk '{print $'$F1', $'$F2', $'$F3', $'$F4'}' \
+          | while read FIRST SECOND THIRD FORTH
+do
+      # Based on the UNIX Flavor, tell the user the 
+      # result of the statistics gathered.
+
+      case $OS in
+      AIX|HP-UX|SunOS)
+            echo "\nUser part is ${FIRST}%"
+            echo "System part is ${SECOND}%"
+            echo "I/O wait state is ${FORTH}%"
+            echo "Idle time is ${FORTH}%\n"
+            ;;
+      Linux)
+            echo "\nUser part is ${FIRST}%"
+            echo "Nice part is ${SECOND}%"
+            echo "System part is ${THIRD}%"
+            echo "Idle time is ${FORTH}%\n"
+            ;;
+      esac
+done
+